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Long-Term Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2011
Long-Term Incentive Plans [Abstract]  
Transactions Involving Stock Option Awards
Transactions involving stock option awards during 2011 under the 2000 Incentive Plan is summarized in the table below.

 
 
 
 
 
Stock Options:
 
 
 
 
Number of Shares
 
 
 
Weighted-Average
Exercise Price
Weighted-Average Remaining Contractual Term (in years)
 
 
 
Intrinsic Value (in thousands)
Outstanding at December 31, 2010
23,362,248
$19.93
   
2011:   Granted
4,286,640
$51.96
   
             Forfeited
(247,898)
$28.11
   
             Expired
(551,456)
$13.31
   
             Exercised
 (4,523,173)
$18.73
   
             Outstanding at December 31, 2011
22,326,361
$26.40
6.90
$663,376
         
Vested and expected to vest at December 31, 2011
21,755,141
$26.04
6.84
$653,990
         
Exercisable at December 31, 2011
11,963,345
$18.27
5.27
$451,478
Weighted-Average Exercise Prices and Weighted-Average Grant-Date Fair Values of Options Issued
The fair value of each option granted under the 2000 Incentive Plan during 2011, 2010, and 2009 was estimated on the date of grant using the Black-Scholes option-pricing model.

 
 
Number of Options Granted
Weighted-Average Exercise Price
Weighted-Average Fair Value
2011:
     
   Exercise price equal to Market Price
4,286,640
$51.96
$23.82
       
2010:
     
   Exercise price equal to Market Price
4,319,856
$29.43
$13.36
       
2009:
     
   Exercise price equal to Market Price
3,490,560
$20.69
$10.89
Weighted-Average Values of Assumptions Used in Computing Fair Value of Option Grants
The following table summarizes the weighted average values of the assumptions used in computing the fair value of option grants during 2011, 2010, and 2009.

 
 
2011
2010
2009
Expected volatility
48%
47%
54%
Expected lives from grant date
6.1 years
5.6 years
  5.9 years
Expected dividend yield
0%
0%
0%
Risk-free interest rate
1.31%
2.11%
2.87%
Activity Related to Restricted Stock Awards
A summary of the Company's activity related to Restricted Stock awards for the year ended December 31, 2011 is summarized below:

 
 
 
Restricted Stock:
 
 
Number of Shares
 
Weighted-Average
Grant Date Fair Value
Outstanding at December 31, 2010
845,000
 
$25.37
2011:   Granted
16,500
 
$58.59
             Released
(110,001)
 
$30.63
             Outstanding at December 31, 2011
751,499
 
$25.33